m68k: merge m68k and m68knommu arch directories

There is a lot of common code that could be shared between the m68k
and m68knommu arch branches. It makes sense to merge the two branches
into a single directory structure so that we can more easily share
that common code.

This is a brute force merge, based on a script from Stephen King
<sfking@fdwdc.com>, which was originally written by Arnd Bergmann
<arnd@arndb.de>.

> The script was inspired by the script Sam Ravnborg used to merge the
> includes from m68knommu. For those files common to both arches but
> differing in content, the m68k version of the file is renamed to
> <file>_mm.<ext> and the m68knommu version of the file is moved into the
> corresponding m68k directory and renamed <file>_no.<ext> and a small
> wrapper file <file>.<ext> is used to select between the two version. Files
> that are common to both but don't differ are removed from the m68knommu
> tree and files and directories that are unique to the m68knommu tree are
> moved to the m68k tree. Finally, the arch/m68knommu tree is removed.
>
> To select between the the versions of the files, the wrapper uses
>
> #ifdef CONFIG_MMU
> #include <file>_mm.<ext>
> #else
> #include <file>_no.<ext>
> #endif

On top of this file merge I have done a simplistic merge of m68k and
m68knommu Kconfig, which primarily attempts to keep existing options and
menus in place. Other than a handful of options being moved it produces
identical .config outputs on m68k and m68knommu targets I tested it on.

With this in place there is now quite a bit of scope for merge cleanups
in future patches.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

1 files changed, 365 insertions, 0 deletions

diff --git a/arch/m68k/kernel/traps_no.c b/arch/m68k/kernel/traps_no.c
new file mode 100644
index 000000000000..a768008dfd06
--- /dev/null
+++ b/arch/m68k/kernel/traps_no.c
@@ -0,0 +1,365 @@
+/*
+ *  linux/arch/m68knommu/kernel/traps.c
+ *
+ *  Copyright (C) 1993, 1994 by Hamish Macdonald
+ *
+ *  68040 fixes by Michael Rausch
+ *  68040 fixes by Martin Apel
+ *  68060 fixes by Roman Hodek
+ *  68060 fixes by Jesper Skov
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+/*
+ * Sets up all exception vectors
+ */
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/user.h>
+#include <linux/string.h>
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <linux/ptrace.h>
+#include <linux/kallsyms.h>
+
+#include <asm/setup.h>
+#include <asm/fpu.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/traps.h>
+#include <asm/pgtable.h>
+#include <asm/machdep.h>
+#include <asm/siginfo.h>
+
+static char const * const vec_names[] = {
+	"RESET SP", "RESET PC", "BUS ERROR", "ADDRESS ERROR",
+	"ILLEGAL INSTRUCTION", "ZERO DIVIDE", "CHK", "TRAPcc",
+	"PRIVILEGE VIOLATION", "TRACE", "LINE 1010", "LINE 1111",
+	"UNASSIGNED RESERVED 12", "COPROCESSOR PROTOCOL VIOLATION",
+	"FORMAT ERROR", "UNINITIALIZED INTERRUPT",
+	"UNASSIGNED RESERVED 16", "UNASSIGNED RESERVED 17",
+	"UNASSIGNED RESERVED 18", "UNASSIGNED RESERVED 19",
+	"UNASSIGNED RESERVED 20", "UNASSIGNED RESERVED 21",
+	"UNASSIGNED RESERVED 22", "UNASSIGNED RESERVED 23",
+	"SPURIOUS INTERRUPT", "LEVEL 1 INT", "LEVEL 2 INT", "LEVEL 3 INT",
+	"LEVEL 4 INT", "LEVEL 5 INT", "LEVEL 6 INT", "LEVEL 7 INT",
+	"SYSCALL", "TRAP #1", "TRAP #2", "TRAP #3",
+	"TRAP #4", "TRAP #5", "TRAP #6", "TRAP #7",
+	"TRAP #8", "TRAP #9", "TRAP #10", "TRAP #11",
+	"TRAP #12", "TRAP #13", "TRAP #14", "TRAP #15",
+	"FPCP BSUN", "FPCP INEXACT", "FPCP DIV BY 0", "FPCP UNDERFLOW",
+	"FPCP OPERAND ERROR", "FPCP OVERFLOW", "FPCP SNAN",
+	"FPCP UNSUPPORTED OPERATION",
+	"MMU CONFIGURATION ERROR"
+};
+
+void __init trap_init(void)
+{
+}
+
+void die_if_kernel(char *str, struct pt_regs *fp, int nr)
+{
+	if (!(fp->sr & PS_S))
+		return;
+
+	console_verbose();
+	printk(KERN_EMERG "%s: %08x\n",str,nr);
+	printk(KERN_EMERG "PC: [<%08lx>]\nSR: %04x  SP: %p  a2: %08lx\n",
+	       fp->pc, fp->sr, fp, fp->a2);
+	printk(KERN_EMERG "d0: %08lx    d1: %08lx    d2: %08lx    d3: %08lx\n",
+	       fp->d0, fp->d1, fp->d2, fp->d3);
+	printk(KERN_EMERG "d4: %08lx    d5: %08lx    a0: %08lx    a1: %08lx\n",
+	       fp->d4, fp->d5, fp->a0, fp->a1);
+
+	printk(KERN_EMERG "Process %s (pid: %d, stackpage=%08lx)\n",
+		current->comm, current->pid, PAGE_SIZE+(unsigned long)current);
+	show_stack(NULL, (unsigned long *)(fp + 1));
+	add_taint(TAINT_DIE);
+	do_exit(SIGSEGV);
+}
+
+asmlinkage void buserr_c(struct frame *fp)
+{
+	/* Only set esp0 if coming from user mode */
+	if (user_mode(&fp->ptregs))
+		current->thread.esp0 = (unsigned long) fp;
+
+#if defined(DEBUG)
+	printk (KERN_DEBUG "*** Bus Error *** Format is %x\n", fp->ptregs.format);
+#endif
+
+	die_if_kernel("bad frame format",&fp->ptregs,0);
+#if defined(DEBUG)
+	printk(KERN_DEBUG "Unknown SIGSEGV - 4\n");
+#endif
+	force_sig(SIGSEGV, current);
+}
+
+static void print_this_address(unsigned long addr, int i)
+{
+#ifdef CONFIG_KALLSYMS
+	printk(KERN_EMERG " [%08lx] ", addr);
+	print_symbol(KERN_CONT "%s\n", addr);
+#else
+	if (i % 5)
+		printk(KERN_CONT " [%08lx] ", addr);
+	else
+		printk(KERN_EMERG " [%08lx] ", addr);
+	i++;
+#endif
+}
+
+int kstack_depth_to_print = 48;
+
+static void __show_stack(struct task_struct *task, unsigned long *stack)
+{
+	unsigned long *endstack, addr;
+#ifdef CONFIG_FRAME_POINTER
+	unsigned long *last_stack;
+#endif
+	int i;
+
+	if (!stack)
+		stack = (unsigned long *)task->thread.ksp;
+
+	addr = (unsigned long) stack;
+	endstack = (unsigned long *) PAGE_ALIGN(addr);
+
+	printk(KERN_EMERG "Stack from %08lx:", (unsigned long)stack);
+	for (i = 0; i < kstack_depth_to_print; i++) {
+		if (stack + 1 + i > endstack)
+			break;
+		if (i % 8 == 0)
+			printk(KERN_EMERG "       ");
+		printk(KERN_CONT " %08lx", *(stack + i));
+	}
+	printk("\n");
+	i = 0;
+
+#ifdef CONFIG_FRAME_POINTER
+	printk(KERN_EMERG "Call Trace:\n");
+
+	last_stack = stack - 1;
+	while (stack <= endstack && stack > last_stack) {
+
+		addr = *(stack + 1);
+		print_this_address(addr, i);
+		i++;
+
+		last_stack = stack;
+		stack = (unsigned long *)*stack;
+	}
+	printk("\n");
+#else
+	printk(KERN_EMERG "Call Trace with CONFIG_FRAME_POINTER disabled:\n");
+	while (stack <= endstack) {
+		addr = *stack++;
+		/*
+		 * If the address is either in the text segment of the kernel,
+		 * or in a region which is occupied by a module then it *may*
+		 * be the address of a calling routine; if so, print it so that
+		 * someone tracing down the cause of the crash will be able to
+		 * figure out the call path that was taken.
+		 */
+		if (__kernel_text_address(addr)) {
+			print_this_address(addr, i);
+			i++;
+		}
+	}
+	printk(KERN_CONT "\n");
+#endif
+}
+
+void bad_super_trap(struct frame *fp)
+{
+	int vector = (fp->ptregs.vector >> 2) & 0xff;
+
+	console_verbose();
+	if (vector < ARRAY_SIZE(vec_names))
+		printk (KERN_WARNING "*** %s ***   FORMAT=%X\n",
+			vec_names[vector],
+			fp->ptregs.format);
+	else
+		printk (KERN_WARNING "*** Exception %d ***   FORMAT=%X\n",
+			vector,
+			fp->ptregs.format);
+	printk (KERN_WARNING "Current process id is %d\n", current->pid);
+	die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
+}
+
+asmlinkage void trap_c(struct frame *fp)
+{
+	int sig;
+	int vector = (fp->ptregs.vector >> 2) & 0xff;
+	siginfo_t info;
+
+	if (fp->ptregs.sr & PS_S) {
+		if (vector == VEC_TRACE) {
+			/* traced a trapping instruction */
+		} else
+			bad_super_trap(fp);
+		return;
+	}
+
+	/* send the appropriate signal to the user program */
+	switch (vector) {
+	    case VEC_ADDRERR:
+		info.si_code = BUS_ADRALN;
+		sig = SIGBUS;
+		break;
+	    case VEC_ILLEGAL:
+	    case VEC_LINE10:
+	    case VEC_LINE11:
+		info.si_code = ILL_ILLOPC;
+		sig = SIGILL;
+		break;
+	    case VEC_PRIV:
+		info.si_code = ILL_PRVOPC;
+		sig = SIGILL;
+		break;
+	    case VEC_COPROC:
+		info.si_code = ILL_COPROC;
+		sig = SIGILL;
+		break;
+	    case VEC_TRAP1: /* gdbserver breakpoint */
+		fp->ptregs.pc -= 2;
+		info.si_code = TRAP_TRACE;
+		sig = SIGTRAP;
+		break;
+	    case VEC_TRAP2:
+	    case VEC_TRAP3:
+	    case VEC_TRAP4:
+	    case VEC_TRAP5:
+	    case VEC_TRAP6:
+	    case VEC_TRAP7:
+	    case VEC_TRAP8:
+	    case VEC_TRAP9:
+	    case VEC_TRAP10:
+	    case VEC_TRAP11:
+	    case VEC_TRAP12:
+	    case VEC_TRAP13:
+	    case VEC_TRAP14:
+		info.si_code = ILL_ILLTRP;
+		sig = SIGILL;
+		break;
+	    case VEC_FPBRUC:
+	    case VEC_FPOE:
+	    case VEC_FPNAN:
+		info.si_code = FPE_FLTINV;
+		sig = SIGFPE;
+		break;
+	    case VEC_FPIR:
+		info.si_code = FPE_FLTRES;
+		sig = SIGFPE;
+		break;
+	    case VEC_FPDIVZ:
+		info.si_code = FPE_FLTDIV;
+		sig = SIGFPE;
+		break;
+	    case VEC_FPUNDER:
+		info.si_code = FPE_FLTUND;
+		sig = SIGFPE;
+		break;
+	    case VEC_FPOVER:
+		info.si_code = FPE_FLTOVF;
+		sig = SIGFPE;
+		break;
+	    case VEC_ZERODIV:
+		info.si_code = FPE_INTDIV;
+		sig = SIGFPE;
+		break;
+	    case VEC_CHK:
+	    case VEC_TRAP:
+		info.si_code = FPE_INTOVF;
+		sig = SIGFPE;
+		break;
+	    case VEC_TRACE:		/* ptrace single step */
+		info.si_code = TRAP_TRACE;
+		sig = SIGTRAP;
+		break;
+	    case VEC_TRAP15:		/* breakpoint */
+		info.si_code = TRAP_BRKPT;
+		sig = SIGTRAP;
+		break;
+	    default:
+		info.si_code = ILL_ILLOPC;
+		sig = SIGILL;
+		break;
+	}
+	info.si_signo = sig;
+	info.si_errno = 0;
+	switch (fp->ptregs.format) {
+	    default:
+		info.si_addr = (void *) fp->ptregs.pc;
+		break;
+	    case 2:
+		info.si_addr = (void *) fp->un.fmt2.iaddr;
+		break;
+	    case 7:
+		info.si_addr = (void *) fp->un.fmt7.effaddr;
+		break;
+	    case 9:
+		info.si_addr = (void *) fp->un.fmt9.iaddr;
+		break;
+	    case 10:
+		info.si_addr = (void *) fp->un.fmta.daddr;
+		break;
+	    case 11:
+		info.si_addr = (void *) fp->un.fmtb.daddr;
+		break;
+	}
+	force_sig_info (sig, &info, current);
+}
+
+asmlinkage void set_esp0(unsigned long ssp)
+{
+	current->thread.esp0 = ssp;
+}
+
+/*
+ * The architecture-independent backtrace generator
+ */
+void dump_stack(void)
+{
+	/*
+	 * We need frame pointers for this little trick, which works as follows:
+	 *
+	 * +------------+ 0x00
+	 * | Next SP	|	-> 0x0c
+	 * +------------+ 0x04
+	 * | Caller	|
+	 * +------------+ 0x08
+	 * | Local vars	|	-> our stack var
+	 * +------------+ 0x0c
+	 * | Next SP	|	-> 0x18, that is what we pass to show_stack()
+	 * +------------+ 0x10
+	 * | Caller	|
+	 * +------------+ 0x14
+	 * | Local vars	|
+	 * +------------+ 0x18
+	 * | ...	|
+	 * +------------+
+	 */
+
+	unsigned long *stack;
+
+	stack = (unsigned long *)&stack;
+	stack++;
+	__show_stack(current, stack);
+}
+EXPORT_SYMBOL(dump_stack);
+
+void show_stack(struct task_struct *task, unsigned long *stack)
+{
+	if (!stack && !task)
+		dump_stack();
+	else
+		__show_stack(task, stack);
+}